Source : Webster's Revised Unabridged Dictionary (1913)

Millenarian \Mil`le*na"ri*an\, a. [See {Millenary}.]
   Consisting of a thousand years; of or pertaining to the
   millennium, or to the Millenarians.

Millenarian \Mil`le*na"ri*an\, n.
   One who believes that Christ will personally reign on earth a
   thousand years; a Chiliast.

Source : WordNet®

millenarian
     adj : relating to or believing in the millennium of peace and
           happiness [syn: {chiliastic}]

millenarian
     n : a person who believes in the coming of the millennium (a
         time of great peace and prosperity) [syn: {millenarist},
         {chiliast}]